PAC1941T-1ESLASH4MX. datasheet(22/96 Pages) MICROCHIP

Part #	PAC1941T-1E/4MX.

Description	Single/Multi-Channel Power Monitor with Accumulator, 9V Full-Scale Range

PDF	96 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

Logo

22 / 96 page

PAC194X

DS20006543A-page 22

 2021 Microchip Technology Inc.

4.1

Layout Considerations

It is important to optimize the layout of the RSENSE to

ensure the most accurate measurements. When

RSENSE values are very low, resistor connections and

solder joint variation can play a large role in the accu-

racy of the system. Figure 4-3 shows the recom-

mended PCB pattern for a sense resistor (highlighted

in red) with wide metal trace for the high-current path.

The drawing shows metal, solder paste openings and

the resistor outline. VSOURCE connects to the +terminal

of the high-current path and the load connects to the

-terminal of the high-current path. SENSE+ and

SENSE- have a Kelvin connection to the current sense

resistor to ensure that no metal with high current is

included in the VSENSE measurement path. SENSE+

and SENSE- must be routed as a differential pair to the

SENSE inputs at the chip. The input pins allow for a

typical VSENSE trace resistance of 1 k, which allows

the routing flexibility far from the chip itself on the

board.

FIGURE 4-3:

PCB Pattern for Sense

Resistor.

High Current Path

Sense Resistor

Kelvin Connections

PAC1941T-1E/4MX. Datasheet(PDF) 22 Page - Microchip Technology